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How to write this query?

I have two tables called ‘contests’ and ‘entries’. A contest can have many entries but a entry can belong to only one contest. Therefore, ‘entries’ has two columns – entry_id as primary key and contest_id as a foreign key that references to ‘contests’ table. Now, If I were to have an entry with entry_id equal to 1: is there a single query I can use to find all the entries that belong to the same contest as does the entry with entry_id equal to 1.

I can see how can I do with two separate queries, but is there an unified query as well?